RELIABILITY: Guaranteed compatibility and performance that matches the original part, ensuring your nailer operates smoothly and safely after installation.  DURABLE CONSTRUCTION: Made from high-grade spring steel, designed for excellent tensile strength and fatigue resistance to ensure long-lasting durability under high-cycle use.  COST-EFFECTIVE SOLUTION: Get your nailer back in working order without the high cost of OEM parts. This pack offers exceptional value, extending the life of your tool.  CONVENIENT： 2-PACK: Includes two identical springs. Replace the worn-out part immediately and keep an extra on hand for quick future maintenance, minimizing downtime.  Compatibility List：Compatible Nailer Models: Hitachi NR65AK2, Hitachi NR65AK (also compatible with Metabo HPT branded versions of these tools). Replaces Part Numbers: 883-440, 883440. Important: Please verify your nailer's model number and the number on your old spring before purchasing to ensure a correct fit.